Commit graph

10 commits

Author SHA1 Message Date
Marc Dietrich
a2c4ef0977 video: backlight: fix pwm inversion
set_pwm() will always fail with -ENOSYS if pwm_ops set_invert() is
not implemented, leaving the backlight dark. Fix this by returning
no error if set_invert() is not implemented and no polarity change
is requested.

Fixes: 57e7775413 ("video: backlight: Parse PWM polarity cell")
Signed-off-by: Marc Dietrich <marvin24@gmx.de>
2019-07-06 23:31:52 +02:00
Stefan Mavrodiev
57e7775413 video: backlight: Parse PWM polarity cell
This patch enables the reading of the polarity cell from a PWM
phandle and calls pwm_set_invert().

Not all platforms have polarity cell, so skip if it's not pressent.

Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
2019-04-14 14:17:36 +02:00
Simon Glass
4a978e86d7 video: backlight: Fix log message in enable_sequence()
This has an extra argument. Remove it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
2018-12-05 06:01:35 -07:00
Simon Glass
a4f737a9c3 panel: Expand the backlight support
At present the panel can be turned on but not off, and the brightness
cannot be controlled at run-time. Add a new API function to both the panel
and backlight uclasses to handle this. Enhance the PWM backlight driver
to deal with custom levels properly and allow the backlight to be turned
on and off.

Update the test to cover thes new features.

Signed-off-by: Simon Glass <sjg@chromium.org>
2018-10-09 04:40:27 -06:00
Tom Rini
83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00
Tom Rini
d024236e5a Remove unnecessary instances of DECLARE_GLOBAL_DATA_PTR
We have a large number of places where while we historically referenced
gd in the code we no longer do, as well as cases where the code added
that line "just in case" during development and never dropped it.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-04-27 14:54:48 -04:00
Kever Yang
19f124d829 pwm-backlight: make power-supply as option
Some pwm backlight may not need 'power-supply', let's make it as option
in pwm-backlight driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
2018-03-06 10:17:15 +01:00
Simon Glass
7cf208d73b dm: video: Update pwm_backlight to support livetree
Update this driver to support a live device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-on: Beaver, Jetson-TK1
2017-07-11 10:08:20 -06:00
Simon Glass
e160f7d430 dm: core: Replace of_offset with accessor
At present devices use a simple integer offset to record the device tree
node associated with the device. In preparation for supporting a live
device tree, which uses a node pointer instead, refactor existing code to
access this field through an inline function.

Signed-off-by: Simon Glass <sjg@chromium.org>
2017-02-08 06:12:14 -07:00
Simon Glass
65fba5927c dm: backlight: Add a driver for a PWM backlight
Many backlights need to use a PWM to control the brightness. Add a driver
for this. It understands the standard device tree binding.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-01-21 20:42:36 -07:00